Corner shelf



FIG. 1 is a top plan view of a corner shelf embodying our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear side elevational view thereof, the adjacent rear side being a mirror image of that shown; and

FIG. 5 is a top and side perspective view thereof. 

The ornamental design for a corner shelf, as shown and described. 